The music video for title track "Mr. Chu", composed by Duble Sidekick, was released on March 31 along with the album.

The poster showed the Apink members wearing navy blue dresses and posing with serious expressions, while holding a book.

It appears that the image leakage was due to a mistake of a staff member, who is involved in the fourth mini album production.

[11] A video teaser featuring Apink's six members participating in a photo shoot for the new album cover was released with "Mr. Chu" in the background.

[13] On March 27, A Cube released music video teaser for "Mr. Chu" on Apink official YouTube Channel.

A Cube released a statement, "Due to the magnitude of the passenger ship sinking, Apink felt too much pain and did not think they could sing for their fans with a light heart, which is how this decision came to be made.

[19] The music video for "Mr. Chu" was released on March 31, 2014,[20] and was directed by Song Wonmo and Park Sangwoo of Digipedi Studio.